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Table 1 Overview of planning and conversion scenarios

From: A novel implementation of mARC treatment for non-dedicated planning systems using converted IMRT plans

 

Original step-and-shoot plan

Conversion

Converted mARC plan

Prostate

Version a

19 beams

Convert directly as is

8 arclets

 

35 segments

 

11 hybrid fields

Version b

19 beams 35 segments Same plan as version a

Split beams with more than 1 segment into two beams spaced 4° apart (one beam −2°, one +2° relative to original), this gives 26 beams, then convert

22 arclets 4 hybrid fields

Version c

30 beams 35 segments

Convert directly

25 arclets 5 hybrid fields

Head and neck

Version a

18 beams 50 segments

Split each beam with More than 1 segment into two beams spaced 6° apart (one beam −3°, one +3° relative to original)

26 arclets 5 hybrid fields

Version b

36 beams

Convert directly

27 arclets

 

50 segments

 

9 hybrid fields

Version c

36 beams 72 segments

Do not change beams, but order segments in a way that two rotations are made, so the first segment of each beam is irradiated on the cw arc; the rest of the segments are included in the ccw arc

Clockwise: pure mARC including only 36 arclets (not hybrid) Counter-clockwise: 23 arclets, 6 hybrid fields